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From: Greg KH on 30 Mar 2010 19:30
2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

From: Dmitry Monakhov <dmonakhov(a)openvz.org>

commit c469070aea5a0ada45a836937c776fd3083dae2b upstream.

Since we implemented generic reserved space management interface,
then it is possible to account reserved space even when quota
is not active (similar to i_blocks/i_bytes).

Without this patch following testcase result in massive comlain from
WARN_ON in dquot_claim_space()

TEST_CASE:
mount /dev/sdb /mnt -oquota
dd if=/dev/zero of=/mnt/test bs=1M count=1
quotaon /mnt
# fs_reserved_spave == 1Mb
# quota_reserved_space == 0, because quota was disabled
dd if=/dev/zero of=/mnt/test seek=1 bs=1M count=1
# fs_reserved_spave == 2Mb
# quota_reserved_space == 1Mb
sync # ->dquot_claim_space() -> WARN_ON

Signed-off-by: Dmitry Monakhov <dmonakhov(a)openvz.org>
Signed-off-by: Jan Kara <jack(a)suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
fs/quota/dquot.c | 10 ++++++----
include/linux/quotaops.h | 11 +++++++++--
2 files changed, 15 insertions(+), 6 deletions(-)

--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1399,28 +1399,30 @@ static qsize_t *inode_reserved_space(str
return inode->i_sb->dq_op->get_reserved_space(inode);
}

-static void inode_add_rsv_space(struct inode *inode, qsize_t number)
+void inode_add_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
*inode_reserved_space(inode) += number;
spin_unlock(&inode->i_lock);
}
+EXPORT_SYMBOL(inode_add_rsv_space);

-
-static void inode_claim_rsv_space(struct inode *inode, qsize_t number)
+void inode_claim_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
*inode_reserved_space(inode) -= number;
__inode_add_bytes(inode, number);
spin_unlock(&inode->i_lock);
}
+EXPORT_SYMBOL(inode_claim_rsv_space);

-static void inode_sub_rsv_space(struct inode *inode, qsize_t number)
+void inode_sub_rsv_space(struct inode *inode, qsize_t number)
{
spin_lock(&inode->i_lock);
*inode_reserved_space(inode) -= number;
spin_unlock(&inode->i_lock);
}
+EXPORT_SYMBOL(inode_sub_rsv_space);

static qsize_t inode_get_rsv_space(struct inode *inode)
{
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -26,6 +26,10 @@ static inline void writeout_quota_sb(str
sb->s_qcop->quota_sync(sb, type);
}

+void inode_add_rsv_space(struct inode *inode, qsize_t number);
+void inode_claim_rsv_space(struct inode *inode, qsize_t number);
+void inode_sub_rsv_space(struct inode *inode, qsize_t number);
+
int dquot_initialize(struct inode *inode, int type);
int dquot_drop(struct inode *inode);
struct dquot *dqget(struct super_block *sb, unsigned int id, int type);
@@ -42,7 +46,6 @@ int dquot_alloc_inode(const struct inode
int dquot_reserve_space(struct inode *inode, qsize_t number, int prealloc);
int dquot_claim_space(struct inode *inode, qsize_t number);
void dquot_release_reserved_space(struct inode *inode, qsize_t number);
-qsize_t dquot_get_reserved_space(struct inode *inode);

int dquot_free_space(struct inode *inode, qsize_t number);
int dquot_free_inode(const struct inode *inode, qsize_t number);
@@ -199,6 +202,8 @@ static inline int vfs_dq_reserve_space(s
if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
return 1;
}
+ else
+ inode_add_rsv_space(inode, nr);
return 0;
}

@@ -221,7 +226,7 @@ static inline int vfs_dq_claim_space(str
if (inode->i_sb->dq_op->claim_space(inode, nr) == NO_QUOTA)
return 1;
} else
- inode_add_bytes(inode, nr);
+ inode_claim_rsv_space(inode, nr);

mark_inode_dirty(inode);
return 0;
@@ -235,6 +240,8 @@ void vfs_dq_release_reservation_space(st
{
if (sb_any_quota_active(inode->i_sb))
inode->i_sb->dq_op->release_rsv(inode, nr);
+ else
+ inode_sub_rsv_space(inode, nr);
}

static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)


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